package com.falling.reggie.controller;


import com.falling.reggie.common.R;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

@RestController
@RequestMapping("/common")
public class CommonController {

    @Value("${reggie.path}")
    private String filePath;

    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){ // file参数名必须与请求头中表单数据name字段值一致
        // file为临时文件
        File dir = new File(filePath);
        if (!dir.exists()){
            dir.mkdirs();
        }

        String originalFilename = file.getOriginalFilename();
        assert originalFilename != null;
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        String fileName = UUID.randomUUID().toString() + suffix;
        try {
            file.transferTo(new File(filePath + fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);
    }

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try (
                FileInputStream inputStream = new FileInputStream(filePath + name);
                ServletOutputStream outputStream = response.getOutputStream();
                ){

            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = inputStream.read(bytes)) != -1){
                outputStream.write(bytes, 0, len);
                outputStream.flush();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

}
